Auto merge of rust-lang#127757 - workingjubilee:rollup-4dbks5r, r=workingjubilee

Rollup of 3 pull requests

Successful merges:

 - rust-lang#127712 (Windows: Remove some unnecessary type aliases)
 - rust-lang#127744 (std: `#![deny(unsafe_op_in_unsafe_fn)]` in platform-independent code)
 - rust-lang#127750 (Make os/windows and pal/windows default to `#![deny(unsafe_op_in_unsafe_fn)]`)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

library/std/src/sync/mpmc/array.rs

@@ -200,11 +200,12 @@ impl<T> Channel<T> {
             return Err(msg);
         }
 
-        let slot: &Slot<T> = &*(token.array.slot as *const Slot<T>);
-
         // Write the message into the slot and update the stamp.
-        slot.msg.get().write(MaybeUninit::new(msg));
-        slot.stamp.store(token.array.stamp, Ordering::Release);
+        unsafe {
+            let slot: &Slot<T> = &*(token.array.slot as *const Slot<T>);
+            slot.msg.get().write(MaybeUninit::new(msg));
+            slot.stamp.store(token.array.stamp, Ordering::Release);
+        }
 
         // Wake a sleeping receiver.
         self.receivers.notify();
@@ -291,11 +292,14 @@ impl<T> Channel<T> {
             return Err(());
         }
 
-        let slot: &Slot<T> = &*(token.array.slot as *const Slot<T>);
-
         // Read the message from the slot and update the stamp.
-        let msg = slot.msg.get().read().assume_init();
-        slot.stamp.store(token.array.stamp, Ordering::Release);
+        let msg = unsafe {
+            let slot: &Slot<T> = &*(token.array.slot as *const Slot<T>);
+
+            let msg = slot.msg.get().read().assume_init();
+            slot.stamp.store(token.array.stamp, Ordering::Release);
+            msg
+        };
 
         // Wake a sleeping sender.
         self.senders.notify();
@@ -471,7 +475,7 @@ impl<T> Channel<T> {
             false
         };
 
-        self.discard_all_messages(tail);
+        unsafe { self.discard_all_messages(tail) };
         disconnected
     }
 

library/std/src/sync/mpmc/counter.rs

@@ -63,7 +63,7 @@ impl<C> Sender<C> {
             disconnect(&self.counter().chan);
 
             if self.counter().destroy.swap(true, Ordering::AcqRel) {
-                drop(Box::from_raw(self.counter));
+                drop(unsafe { Box::from_raw(self.counter) });
             }
         }
     }
@@ -116,7 +116,7 @@ impl<C> Receiver<C> {
             disconnect(&self.counter().chan);
 
             if self.counter().destroy.swap(true, Ordering::AcqRel) {
-                drop(Box::from_raw(self.counter));
+                drop(unsafe { Box::from_raw(self.counter) });
             }
         }
     }